<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Topology Drag-and-Drop Editor</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
        #canvas {
            width: 100vw;
            height: 100vh;
        }
        #controls {
            width: 100vw;
            height: 10vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
    </style>
</head>
<body>
    <div id="controls">
        <button id="add-node">Add Node</button>
    </div>
    <div id="canvas"></div>
    <script src="https://d3js.org/d3.v6.min.js"></script>
    <script src="main2.js"></script>
</body>
</html>
